> I don't understand how market regulators allow this. The US government is literally for sale. Businesses know that this window is limited and are executing antitrust manuvers left and right while they can.
So those businesses either know, or expect, that either:
a) these guidelines will be changed in a way that makes them hard or impossible to revert (i.e. through legislation or a Supreme Court judgement); or
b) there is little risk of a future change of administration.